Scientists improved Mendeleev’s early periodic table by ___.
including physical properties of elements such as melting point and density
including chemical properties of elements such as the ability to burn or to tarnish
using atomic number instead of atomic mass to organize the elements
using numbers of neutrons and protons to organize the elements by their properties

It would take approximately 257.91 cans of soda to reach a lethal dose of caffeine.

If the caffeine concentration in a particular brand of soda is 3.23 mg/oz, then to find the amount of caffeine in one can of soda, we can multiply the concentration by the number of ounces in a can:

Caffeine in one can = 3.23 mg/oz * 12 oz = 38.76 mg

Now, to find out how many cans of soda would be lethal, we can divide the lethal dose of caffeine by the amount of caffeine in one can:

Number of cans = 10.0 g / 38.76 mg = 10000 mg / 38.76 mg = 257.91

So, it would take approximately 257.91 cans of soda to reach a lethal dose of caffeine. However, it is important to note that individual tolerance and sensitivity to caffeine can vary, so it is always best to consume caffeine in moderation and to consult a healthcare professional if you have any concerns.

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In an inverse statement, both the hypothesis and the conclusion of the original conditional statement are negative. The representation of an inverse statement shall be as ~p(not p)→ ~q (not q).

What is conditional statement ?

In mathematics, conditional statements are often used to specify relationships between variables. For example, a simple conditional statement might look like this: "If x > 0, then y = 2x." In this statement, the condition "x > 0" determines whether the relationship "y = 2x" is satisfied.  If x is indeed greater than 0, then y will equal 2 times x. If x is not greater than 0, the relationship "y = 2x" is not satisfied, and the value of y is undefined. Another example of a conditional statement in mathematics is the use of piecewise functions. A piecewise function is a function that is defined in different pieces, each of which corresponds to a different range of values for the independent variable. For example, a function might be defined as f(x) = x^2 for x < 0, and f(x) = x + 1 for x >= 0. In this case, the function is defined differently for different ranges of x, and the appropriate definition is selected based on the value of x.

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2.5 X 10²⁴ atoms of copper is equivalent to 266.7g of Cu.

HOW TO CALCULATE MASS:

Therefore, 2.5 X 10²⁴ atoms of copper is equivalent to 266.7g of Cu.

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Formation and dissociation constants are related in that they are inverses of each other and must have a product that equals the equilibrium constant of the reaction.

Formation and dissociation constants, also known as Kf and Kd respectively, represent the equilibrium concentrations of the reactants and products in a chemical reaction.

Kf is the constant of formation, which is the product of the concentrations of the products of the reaction, divided by the product of the concentrations of the reactants.

Kd is the dissociation constant, which is the product of the concentrations of the reactants, divided by the product of the concentrations of the products .

Kf and Kd are related in that the product of Kf and Kd must equal Kw, which is the equilibrium constant for the reaction.

The value of Kw is constant, meaning that regardless of the equilibrium concentrations of reactants and products, Kf and Kd must be inverses of each other such that the product of Kf and Kd must equal Kw.

Therefore, formation and dissociation constants are related in that they are inverses of each other and must have a product that equals the equilibrium constant of the reaction.

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Iodine (I), the centre atom, is surrounded by two chlorine atoms (Cl), each of which has one electron pair. The centre atom is surrounded by two pairs of unshared electrons as a result.

The atom at the core of a molecule or an ion that is covalently bound to other atoms is referred to as the central atom in chemistry. The coordination number, which is a crucial element in determining the geometry of the molecule or ion, is the quantity of atoms bound to the central atom. As it can establish the most bonds with other atoms, the centre atom usually has the most valence electrons. The core atom's characteristics, such as its electronegativity, size, and capacity for attracting or repelling electrons, have a significant impact on the characteristics and behaviour of the molecule or ion.

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Answer:

17.46× 10²³ molecules

Explanation:

Given data:

Mass of acetic acid = 172.90 g

Number of molecules = ?

Solution:

First of all we will calculate the number of moles of acetic acid :

Number of moles = mass / molar mass

Number of moles = 172.90 g/ 60.1 g/ol

Number of moles = 2.9 mol

Now the given problem will solve by using Avogadro number.

The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ molecules

2.9 mol × 6.022 × 10²³ molecules  / 1 mol

17.46× 10²³ molecules

Avogadro number:

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

Answer:

The answer is a

Explanation:

The atmosphere be fits itself with light gases and therefore the gases no longer evenly mix .

Answer:

Explanation:

Gasses are no longer evenly mixed but

(i) CaCO3 CaO + CO2 is the equation for the breakdown process of marble (CaCO3). (ii) Each product will have a mass equal to the weight of the marble used, or 25 g. Therefore, the mass of CaO and CO2 that are produced will both be 25 g.

(iii) The ideal gas law equation, PV = nRT, can be used to determine the volume of gas produced at S.T.P. where P is pressure, V is volume, n is the number of moles of gas, R is the ideal gas constant, and T is temperature.

We can determine the number of moles of CO2 produced using the formula since the mass of CO2 formed is 25 g.n is therefore 25/44 = 0.568 mol. The volume of gas created at STP may now be determined using the ideal gas law equation: V = (0.568 mol)(8.314 J/mol.K)(273 K)/(101.3 kPa) = 16.9 L. As a result, 16.9 L of petrol are produced at STP.

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The solubility of Mg₃(PO₄)₂ in pure water, in grams per liter is 9.4 x 10⁻⁴ g/L. The correct answer is Option C.

Solubility product constant (Ksp) can be defined as the product of the concentration of the ions of the substance raised to the stoichiometric coefficients of the balanced chemical equation. It is an equilibrium constant and its unit is concentration raised to the power of the stoichiometric coefficients of the balanced chemical equation.

The solubility product of Mg₃(PO₄)₂ is 6.3 x 10⁻²⁶. The balanced chemical equation for Mg₃(PO₄)₂ is given as:

Mg₃(PO₄)₂ (s) ⇌ 3 Mg²⁺ (aq) + 2 PO₄³⁻ (aq)

From the above equation, it can be inferred that the concentration of Mg²⁺ ions is three times the concentration of Mg₃(PO₄)₂ and the concentration of PO₄³⁻ ions is two times the concentration of Mg₃(PO₄)₂.

Therefore, the expression for the solubility product constant can be given as:

Ksp = [Mg²⁺]³ [PO₄³⁻]²

Let the solubility of Mg₃(PO₄)₂ be x. Therefore, the concentration of Mg²⁺ and PO₄³⁻ ions can be given as [Mg²⁺] = 3x and [PO₄³⁻] = 2x.

Substituting these values in the expression for Ksp, we get:

Ksp = (3x)³(2x)² = 108x⁵

6.3 x 10⁻²⁶ = 108x⁵

x⁵ = (6.3 x 10⁻²⁶) / 108

x⁵ = 5.833 x 10⁻²⁸

Molar mass of Mg₃(PO₄)₂ = 262.86 g/mol

Number of moles in x grams of Mg₃(PO₄)₂ = (x / 262.86) mol

Solubility of Mg₃(PO₄)₂ = x / (1000 × 1) L = x / 1000 g/L

Concentration of Mg₃(PO₄)₂ = (x / 1000) / (262.86 × (3 × 2)) = x / 1582.16 mol/L

Concentration of Mg²⁺ = 3x / 1000 mol/L

Concentration of PO₄³⁻ = 2x / 1000 mol/L

Substituting the concentration values in the expression for Ksp, we get:

Ksp = (3x / 1000)³(2x / 1000)² = 108x⁵ / (10¹⁵) = 6.3 x 10⁻²⁶

x⁵ = (6.3 x 10⁻²⁶ × 10¹⁵) / 108

x⁵ = 5.833 × 10⁻¹⁰

x = (5.833 × 10⁻¹⁰)1/5

x = 9.402 × 10⁻⁴ g/L

Therefore, the solubility of Mg₃(PO₄)₂ in pure water, in grams per liter is 9.4 x 10⁻⁴ g/L. Hence, the correct option is C) 9.4 x 10⁻⁴ g/L.

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Answer:

When endothermic reaction takes place, the system gains heat from the surroundings and so the temperature of the surroundings decreases ie. it gets colder

Explanation:

A chemical reaction is exothermic if heat is released by the system into the surroundings.

STUDY WELL!

Answer:

B. electric energy then chemical energy

Explanation:

0.72 moles of hydrochloric acid are needed to completely react with 0.36 moles of lead, based on the mole ratio obtained from the balanced chemical equation.

The given chemical equation shows the reaction of lead with hydrochloric acid to produce lead(II) chloride and hydrogen gas. The coefficients of the reactants and products in the balanced chemical equation indicate the mole ratios of the reactants and products.

According to the equation, 1 mole of lead reacts with 2 moles of hydrochloric acid to produce 1 mole of lead(II) chloride and 1 mole of hydrogen gas.

Therefore, to calculate the amount of hydrochloric acid needed to react completely with 0.36 moles of lead, we can use the mole ratio obtained from the balanced chemical equation.

Since 1 mole of lead reacts with 2 moles of hydrochloric acid, we can say that 0.36 moles of lead would react with 2 x 0.36 = 0.72 moles of hydrochloric acid. Therefore, 0.72 moles of hydrochloric acid are needed to completely react with 0.36 moles of lead.

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The number of moles of gas is 0.0029 mol and the mass of gas is 0.98 grams, the molecular weight of the gas must be 339. This means that the gas is nitrogen (\(N_2\)) since it has a molecular weight of 28.

Pressure is a measure of the force that is applied to an object over a given area. It can be expressed in units of force per unit of area, such as pounds per square inch (psi). Pressure is an important physical quantity, as it is a measure of the ability of a fluid or gas to do work. Pressure is usually exerted on an object by a fluid or gas, such as air, water, or steam.

n = (PV)/(RT)

n = (1 atm)(12 L)/(0.08206 L*atm/molK)(300 K)

n = 0.0029 mol
Since the number of moles of gas is 0.0029 mol and the mass of gas is 0.98 grams, the molecular weight of the gas must be 339. This means that the gas is nitrogen (\(N_2\)) since it has a molecular weight of 28.

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Complete Question:

Answer:

The correct option is;

C. I only

Explanation:

Given that in a chemical reaction, the number of valence electrons in the outermost shell of an atom determines the ratio in which the atom combines with other atoms to have the stable 8 (octet) valence electrons in their outermost shell, we have that atoms in a group combines with atoms in other groups, where possible, in the same ratio.

Therefore, sodium, which is in the first column (group I) combines with atoms of elements in other groups, in the same ratio as atoms of the other elements of the column 1

Since hydrogen combines with chlorine in the same ratio as sodium which is from the first column, hydrogen is also an element from the first column.

The powdery substance that is often referred to as a sacred ingredient in baking is flour. Flour is a versatile ingredient that can be used in a wide range of baked goods.

Flour is made by milling the grains into a fine powder, which can then be used to make a variety of baked goods such as bread, cakes, and pastries. Flour is an essential ingredient in baking, as it provides the structure and texture to baked goods. The protein content of flour is important for determining the strength and elasticity of the dough. This is particularly important in bread-making, where the gluten proteins in the flour are essential for creating the structure of the bread.

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Water does  not stick to the leaves of the plant  owing to the fact that the leaves has a waterproof cuticle.

We know that the leaves are the parts of the plant that are involved in photosynthesis. Photosynthesis is the process by which green plants produce their own food in the presence of sunlight and chlorophyll. We know that the leave has an outer protective covering.

The tissue that plays this outer covering of a plant for is the  epidermis and its waxy cuticle. It prevents damage to the plant.

Water does  not stick to the leaves of the plant  owing to the fact that the leaves has a waterproof cuticle.

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The term used to describe the energy required by the body at rest is one Met (metabolic equivalent). It represents the amount of energy expended by an individual while at rest.

One Met (metabolic equivalent) is defined as the resting metabolic rate (RMR) or the energy expenditure of an individual while at rest. It is a unit used to quantify the energy requirements of various activities relative to the resting metabolic rate. One Met is approximately equal to the amount of energy expended by an individual at rest, which is about 3.5 milliliters of oxygen uptake per kilogram of body weight per minute (3.5 ml O2/kg/min).

The concept of Met is often used in exercise prescription, where different activities are assigned a Met value to estimate the energy expenditure during physical activities. For example, light-intensity activities are typically assigned a value of 2-3 Met, moderate-intensity activities range from 3-6 Met, and vigorous-intensity activities have a Met value greater than 6.

By using Met values, individuals can estimate the energy requirements of different activities and tailor their exercise routines accordingly. It provides a standardized way to compare and quantify the energy expenditure associated with various levels of physical activity.

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Answer:

Now, we have to determine the limiting reagent.

Now, we have to determine the limiting reagent.4 g of H₂ reacts with 32 g of O₂ 1 g of H₂ reacts with 32/4 g of O₂ 3 g of H₂ reacts with 32/4 x 3 = 24 g of

Now, we have to determine the limiting reagent.4 g of H₂ reacts with 32 g of O₂ 1 g of H₂ reacts with 32/4 g of O₂ 3 g of H₂ reacts with 32/4 x 3 = 24 g ofBut according to the question, 29 g of O₂ is present. 2

Now, we have to determine the limiting reagent.4 g of H₂ reacts with 32 g of O₂ 1 g of H₂ reacts with 32/4 g of O₂ 3 g of H₂ reacts with 32/4 x 3 = 24 g ofBut according to the question, 29 g of O₂ is present. 2So, the limiting reactant is hydrogen.

Now, we have to determine the limiting reagent.4 g of H₂ reacts with 32 g of O₂ 1 g of H₂ reacts with 32/4 g of O₂ 3 g of H₂ reacts with 32/4 x 3 = 24 g ofBut according to the question, 29 g of O₂ is present. 2So, the limiting reactant is hydrogen.Now, 4 g of H₂ forms 36 g of H₂O

Now, we have to determine the limiting reagent.4 g of H₂ reacts with 32 g of O₂ 1 g of H₂ reacts with 32/4 g of O₂ 3 g of H₂ reacts with 32/4 x 3 = 24 g ofBut according to the question, 29 g of O₂ is present. 2So, the limiting reactant is hydrogen.Now, 4 g of H₂ forms 36 g of H₂O1 g of H₂ forms 36/4 g of H₂O. 3 g of H₂ forms 36/4 x 3 = 27 g of H₂O

Now, we have to determine the limiting reagent.4 g of H₂ reacts with 32 g of O₂ 1 g of H₂ reacts with 32/4 g of O₂ 3 g of H₂ reacts with 32/4 x 3 = 24 g ofBut according to the question, 29 g of O₂ is present. 2So, the limiting reactant is hydrogen.Now, 4 g of H₂ forms 36 g of H₂O1 g of H₂ forms 36/4 g of H₂O. 3 g of H₂ forms 36/4 x 3 = 27 g of H₂OMaximum amount of water that can be formed is 27 g.

Now, we have to determine the limiting reagent.4 g of H₂ reacts with 32 g of O₂ 1 g of H₂ reacts with 32/4 g of O₂ 3 g of H₂ reacts with 32/4 x 3 = 24 g ofBut according to the question, 29 g of O₂ is present. 2So, the limiting reactant is hydrogen.Now, 4 g of H₂ forms 36 g of H₂O1 g of H₂ forms 36/4 g of H₂O. 3 g of H₂ forms 36/4 x 3 = 27 g of H₂OMaximum amount of water that can be formed is 27 g.For, amount of oxygen left of unreacted, Only 24 g of oxygen will react.

Now, we have to determine the limiting reagent.4 g of H₂ reacts with 32 g of O₂ 1 g of H₂ reacts with 32/4 g of O₂ 3 g of H₂ reacts with 32/4 x 3 = 24 g ofBut according to the question, 29 g of O₂ is present. 2So, the limiting reactant is hydrogen.Now, 4 g of H₂ forms 36 g of H₂O1 g of H₂ forms 36/4 g of H₂O. 3 g of H₂ forms 36/4 x 3 = 27 g of H₂OMaximum amount of water that can be formed is 27 g.For, amount of oxygen left of unreacted, Only 24 g of oxygen will react.But 29 g is the given amount. Amount of oxygen unreacted = 29 - 24 = 5 g

The theoretical yield of the given chemical equation is 64 g and limiting reactant is oxygen.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

As per the equation 4 g hydrogen reacts with 32 g oxygen thus 8 g hydrogen will react with 8×32/4=64 g oxygen.

Thus, the  theoretical yield of the given chemical equation is 64 g .

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The main component in a cement slab in a house is typically Portland cement.

Key points:

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For the given experiment, the time taken by liquids to freeze is the dependent variable.

A variable can be described as an alphabet that is utilized to represent an unknown number. A variable can be described as a quantity that can be changed according to the mathematical problem.

The dependent variable can be defined as a variable that depends on the value of another variable. The dependent variable can be described as the output of a function. If the dependent variable changes then there will be a change in the independent variable.

In the given experiment, both liquids will take different times to freeze. Therefore when she checks them every five minutes until one of them had frozen makes the time a dependent variable.

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The value of for a mixture of polymer is 0.715 if the and the solvent b assume vs/rt = 1/6 and a fudge factor of 0.34 .

Option C is correct.

A polymer is any of a class of normal or engineered substances made out of exceptionally huge particles, called macromolecules, which are products of more straightforward compound units called monomers. Numerous minerals and man-made materials are based on polymers, which are the basis of many living materials.

The following formula can be used to determine the value for a mixture of solvent b and polymer a:

                          = [(1-)/(1-)](1/2)

where p and s are the particular volumes of the polymer and dissolvable, individually, and vs/rt is the volume part of the dissolvable.

             p = 9.0 (cal/cm³)0.5 s

              = 7.5 (cal/cm³)0.5 vs/rt

                           = 1/6

fudge factor = 0.34

Substituting these values , we get:

             = [(1-0.375)/(1-0.375+0.34x0.375)](1/2)

                 = [(0.625)/(0.8745)](1/2)

                           = 0.715

Hence , the value of for the given mixture is 0.715

Incomplete question:

What is the value of 0 for a mixture of polymer A (Sp = 9.0 (cal/cm3)0.5) and the solvent B (85 = 7.5 (cal/cm3)0.5)? Show your work for full credits.  Assume Vs/RT = 1/6 and a fudge factor of 0.34 in corresponding units.

A. 0.375

B. 0.5

C. 0.715

D. 0.035

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Answer:

The Nitric Acid Test is used to check if silver is pure or plated. To do so, file a small part of the item in a discreet area where it cannot be seen. Apply a few drops of nitric acid. If the area turns into creamy white, the silver is pure or sterling.

Explanation:

Answer:

Because warm air is less dense

Explanation:

When added to water, the substance that would produce an acid is SO3. When it dissolves in water, SO3 produces H2SO4 (sulfuric acid). Option D is correct.

Sulfur trioxide (SO3) is a white crystalline solid that is used to make sulfuric acid and other chemicals. SO3 is added to water to create sulfuric acid, which is a potent acid with a wide range of industrial applications. Sulfur trioxide can be created through a variety of chemical processes, including the burning of sulfur dioxide (SO2).

Sulfur trioxide dissolves readily in water, resulting in the formation of sulfuric acid. SO3 + H2O → H2SO4In summary, sulfur trioxide (SO3) is the substance that would produce an acid when added to water. Option D is correct.

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Answer:

ywhehehehehdgdudcdudcd uy dshdcvv

Explanation:

bdbdkzkzjzdkdkzdvdisisksjskakskskzbx vxydcdudschahahbshshs

Answer:Particles in plasmas collide more often.

Plasma particles have high kinetic energy (they move quickly).

Plasma particles are far apart.

The ionized particles have no fixed volume

Explanation:

Plasma is the fourth form of matter which has freely moving electrons in it. The substance can be identified as plasma if its particles collide often and are far apart.

Plasma is a type of matter other than solids, liquids, and gas. They have similar properties to that of gas. Plasma particle collides are often like gases as they move freely in space. Like gases that have no definite shape and volume.

The plasma particles have ionic charges, positive and negative resulting in high kinetic energy. This property allows them to show electromagnetism and electrical conductivity.

The ionized particles are due to the high temperature that allows them to have the property of electrical conductivity and compression.

Therefore, the particles of plasma are ionized and have high kinetic energy.

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Explanation:

CnH2n−2

is the formula for ____________.